A sample is best defined as ______.

A) the first 20% of the population
B) the last 20% of the population
C) a smaller group selected from a given population
D) a smaller group selected from the general populace

A sample is a smaller group selected from a given population. It is important that the sample is representative of the population in order to produce accurate results. A sample selection can involve random or non-random sampling techniques, and can vary in size depending on the research question and resources available. Options A and B are incorrect as 20% of a population does not necessarily represent a good sample, and it is not specified whether it is the first or last 20%. Option D is incorrect as a sample can be drawn from any specific population, not just the general populace.